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whats peoples average mpg on 3.4 setup?

Joe m

Joe m

New member
so with gas prices $3.50 + a gallon for supreme iv come to realize my car has issues. i get about 150-180miles on a 3/4 tank now i have a friend who used to have the same setup i do sept ran a 3.25 and got 300+ on a full tank. i was just wondering what other people are getting? my mods are headers,3.4,ported blower, custome tune. 4" intake, egr and rear 02 are tuned out. i was getting a p0440 code but i belive i fixed it with a new gas cap. is anyone can help enlighten me why my mpg is so bad id like to hear it! oh and i have been driving like a old lady since iv been putting 100+ a week in gas. so its not my driving.
 


yup new plugs,wires,fuel pump and filter within the last 3k miles same as oil. i seamfoad about the same time aswell. just put yet anether thing of lucas injector cleaner in. oh and i run 255 16's if that matters anyway.
 
both kinda, i really only drive to work and home cuz of this issue, and its 25 miles each way. about 15 is freeway each way.
 


seems to be more then me. i had 1/2 tank today im not 1/4 tank and 45 miles driven. seems kinda bad for not speeding or launching off the light or anyhting
 


i doubt its bad gas, cuz iv tried different stations and its been this way for a while now. just starting to hurt the pocket more now that its getting closer to 4$ a gallon
 
the only fuel leak that i could think of would be the sending unit next to the fuel pump in on the gas tank. when i pulled the tank and cleaned it i might not of getting the black cylinder pushed down or locked in the right way? and yes i live in mesa,az its pretty damn big
 


traffic has me at 17-19 MPG if i'm VERY gentle with the pedal.

I just can't hold it in for that long though so I average 14 MPG.

This is top swapped, headered 3.8 pullay.

Close to the kind of power levels you'd see once in boost.

Also have a higher stall...
 
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